Hi bsahu,
When it comes to studying for the GMAT, there are a variety of different resources that you could use. Many Test Takers who use a 'book heavy' study approach end up getting 'stuck' at a particular score level, so you might want to consider other options. Even the best books are limited in what they can teach you; they also can't force you to approach questions in a certain way and their explanations are often one-sided.
Before I can offer you any additional advice, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What study materials have you used so far?
3) How have you scored on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your goal score?
5) When are you planning to take the GMAT?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich